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• Time of issue:2021-05-13
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(Summary description)


According to a report by the Voice of Economy of China Central Radio and Television "Tianxia Finance", hydrogen energy has ushered in a wave of deployment this year, and some photovoltaic companies have entered this field one after another. Compared with other energy sources, hydrogen energy is clean and environmentally friendly, with high energy density, and is regarded by some as the "ultimate energy source". However, in order to develop hydrogen energy on a large scale, there are still bottlenecks in the production, storage, transportation, and use of multiple links, a long industrial chain, and complex technology.

Right now, the northern region is about to enter summer, and the power system is preparing for the peak of summer. As the installed capacity of power generation continues to increase, in recent years, the overall supply of electricity in my country has shown a pattern of oversupply. However, in the winter that has just passed, the phenomenon of power cuts reappeared in some places after many years. According to expert analysis, one of the reasons for this seemingly contradictory phenomenon is the rapid development of renewable energy sources such as photovoltaics and wind power. To support the development of renewable energy, it is necessary to minimize such fluctuations.

Yu Zhuoping, director of the Expert Committee of China Hydrogen Energy Alliance and professor of Tongji University, said that on the power generation side, photovoltaic companies are currently exploring the use of hydrogen storage to optimize power supply. "The power grid hopes to have a stable power source. Hydrogen is now used as an intermediate carrier. The electricity that can be connected to the Internet is used to produce hydrogen. The electricity that cannot be connected to the Internet is actually converted into hydrogen energy and stored. This It can be done on a large scale."

When the electricity load increases, it can operate in the reverse direction, using the stored hydrogen to generate electricity and supply power to the grid. In this way, renewable energy power generation becomes flexible and controllable, no longer "seeing the sky for food", and the pressure on the power grid will be significantly reduced. However, it is worth noting that there are currently no mature application cases for hydrogen storage in the world. Some experts have also questioned this technology. The biggest question is how high energy efficiency is when energy is switched back and forth between electricity and hydrogen energy. ?According to Zhou Zhensheng, CEO of the Hydrogen Energy Division of GCL Group, the energy efficiency is only 40% after a cycle from electricity to hydrogen to electricity.

And currently in the field of energy storage, there are also models such as pumped storage and energy storage batteries. Taking energy storage batteries as an example, the entire process is charging and discharging, and the energy loss is only about 10%, which is significantly higher than hydrogen storage. However, Zhou Zhensheng said that compared with batteries, hydrogen storage also has unparalleled advantages. "General energy storage batteries, lithium batteries, the storage time is very short, at most one week, but hydrogen is not the same, a few years will work, this is a very important point. In addition, it can be reversed in the (grid) Basically, I think the fuel cell can be unrestricted. As long as there is hydrogen, it can be supplied indefinitely."

In addition, the more power stored by the energy storage battery, the larger the space occupied, so it is not suitable for large-scale energy storage scenarios such as power stations. However, pumped storage needs to be close to the water source, and there are also conditions. In a comprehensive comparison, the potential of hydrogen storage is greater. In April, hydrogen storage ushered in policy support. The National Energy Administration issued the "Guiding Opinions on Energy Work for 2021", proposing that it should be demand-oriented and explore the research and demonstration applications of hydrogen energy storage and other innovative energy storage technologies. However, some insiders pointed out that to solve the problem of renewable energy consumption, it is not enough to increase energy storage facilities on the power generation side.

Will hydrogen storage not be used and become a decoration? This is also the most worrying issue for photovoltaic and wind power companies. Yu Zhuoping believes that even if the power grid is not deployed, hydrogen storage will not be useless in the future.

Yu Zhuoping said: "I even use renewable energy to produce hydrogen. I can't go online at all. If there is a lot of (electricity) in some places, and now it’s difficult to go online, I will immediately turn the generated electricity into hydrogen. Just store it and use it on the application side. This is a very good solution. So we say that hydrogen energy will promote the large-scale app